Combined type hydraulic flow control valve

Abstract

The invention relates to the technical field of flow control valves, in particular to a combined type hydraulic flow control valve which comprises a water inlet pipe, a water outlet pipe, a rotary block, a rotary rod, a rotating block, a fixing block, a valve shell and a valve element. The valve further comprises a driving unit, an execution unit and an oil pipe. The driving unit, the execution unit and the oil pipe are arranged on one side of the water inlet pipe and the water outlet pipe, the rotating block, the rotary rod and the valve element are used for controlling the driving unit to work, the driving unit is used for transmitting hydraulic oil to the execution unit, and the execution unit is used for blocking water flow impact in the water inlet pipe. The valve element is rotated through the rotating block to drive the rotary block, then with the cooperation of oil pipes of the driving unit and the execution unit, the purpose that the instantaneous speed of water flow can be reduced while the flow valve is opened is achieved, and the impact force borne by the valve element is smaller; and meanwhile, the rotating block serves as a power source of the driving unit, the working cost is saved, and then the practicability of the valve is improved.

Description

technical field [0001] The invention relates to the technical field of flow control valves, in particular to a composite hydraulic flow control valve. Background technique [0002] The flow control valve controls the flow rate of the orifice by changing the liquid resistance of the orifice under a certain pressure difference, so as to adjust the actuator; when the flow control valve is working, the flow rate is the largest when the medium flows through the constriction of the inner chamber of the valve. , the pressure can be the lowest. If the pressure at this time is lower than the saturated vapor pressure of the medium, the liquid will be vaporized and partially transformed into bubbles containing steam or gas; when the medium flows through the contraction point, the pressure will rise. If it exceeds the saturated vapor pressure value, the bubbles burst and change from vapor phase to liquid phase again. This process is called cavitation or cavitation. The bubbles in the li...

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Problems solved by technology

[0002] The flow control valve controls the flow rate of the orifice by changing the liquid resistance of the orifice under a certain pressure difference, so as to adjust the actuator; when the flow control valve is working, the flow rate is the largest when the medium flows through the constriction of the inner chamber of the valve. , the pressure can be the lowest. If the pressure at this time is lower than the saturated vapor pressure of the medium, the liquid will be vaporized and partially transformed into bubbles containing steam or gas; when the medium flows through the contraction point, the pressure will rise. If it exceeds the saturated vapor pressure value, the bubbles burst and change from vapor phase to liquid phase again. This process is called cavitation or cavitation. The bubbles in the liquid will burst and condense on the surface or inside of the ball valve, and will hit the ball valve with a strong force, causing It is damaged and produces vibration and water hammer, which will cause cavitation on the surface of the ball valve over time, thereby shortening the service life of the flow control valve

[0003] For example, the application number CN201821185913.5 discloses a hydraulic station flow control valve, which includes a control valve body and connecting flanges at both ends of the control valve body. Installation pipes are arranged at both ends of the control valve body, and the connecting flange is close to the control valve. One end of the body is provided with an externally threaded pipe, the mounting pipe is sleeved with a connecting pipe that can be threadedly connected to the externally threaded pipe, a first sealing assembly is provided between the mounting pipe and the connecting pipe, and a The second sealing assembly; this technical solution has the following advantages and effects: the connecting flange is connected to the external pipeline, and the connecting pipe is set between the installation pipe of the control valve body and the external threaded pipe of the connecting flange, so that when the connecting pipe Gradually reduce the degree of threaded connection with the external threaded pipe until it is disengaged. At this time, the control valve body and the connecting flange are separated and it is convenient to disassemble, so as to facilitate the maintenance or replacement of the control valve body; the first seal assembly and the second seal The components are used to maintain the tightness of the connection; however, this technical solution does not deal with the water flow when the water enters, so that the water flow rate changes suddenly, causing water hammer. This hydraulic phenomenon is called water hammer or water hammer. Bubbles in the liquid will burst and condense on the surface or inside of the ball valve, and hit the ball valve with a strong force, causing cavitation on the surface and inside of the ball valve, thereby shortening the service life and causing the limitations of this solution

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